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Provide guidance on required and null properties #141

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I analyzed JSON schema's required and type: ["null"] concepts and have provided guidance on when and how to use them in schema modeling. Also, I've carefully applied this guidance to existing types.

I've been thinking we've needed this for a while, but this conversation was the impetus: #140 (comment)

@jack-berg jack-berg requested a review from a team as a code owner November 25, 2024 23:33
@@ -2,7 +2,7 @@
"$id": "https://opentelemetry.io/otelconfig/meter_provider.json",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"title": "MeterProvider",
"type": ["object", "null"],
"type": "object",
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@jack-berg jack-berg Nov 25, 2024

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Setting meter_provider: is not a sensible thing to do. If you want a noop meter_provider, omit meter_provider altogether.

This same logic applies to all the other places which changed from "type": ["object", "null"] to "type":"object".

@@ -26,9 +26,12 @@
]
}
},
"required": [
"readers"
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A meter_provider without readers isn't sensible.

@@ -211,9 +214,6 @@
"minimum": 0
}
},
"required": [
"endpoint"
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Endpoint is not actually required for zipkin since there's a well defined default value.

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